213054959731 has 4 divisors (see below), whose sum is σ = 213687170632. Its totient is φ = 212422748832.

The previous prime is 213054959729. The next prime is 213054959759. The reversal of 213054959731 is 137959450312.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 213054959731 - 2¹ = 213054959729 is a prime.

It is a super-2 number, since 2×213054959731² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213054959701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 316104945 + ... + 316105618.

It is an arithmetic number, because the mean of its divisors is an integer number (53421792658).

Almost surely, 2^213054959731 is an apocalyptic number.

213054959731 is a deficient number, since it is larger than the sum of its proper divisors (632210901).

213054959731 is an equidigital number, since it uses as much as digits as its factorization.

213054959731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 632210900.

The product of its (nonzero) digits is 1020600, while the sum is 49.

The spelling of 213054959731 in words is "two hundred thirteen billion, fifty-four million, nine hundred fifty-nine thousand, seven hundred thirty-one".